Atoms and Molecules — Science STD 9 — Question

On heating the solid ______________?

A freely falling object travels 4.9m in 1st second, 14.7m in 2nd second, 24.5m in 3rd second, and so on. This data shows that the motion of a freely falling object is a case of:

Which of the following mixture cannot be separated by using water as the solvent?

1. Copper sulphate and sand.
2. Sand and potash alum.
3. Sand and sulphur.
4. Sugar and sand.

Consider the following information in respect of four objects A, B, C and D:

Object	Density (kg/m3)	Volume (m3)	Mass (kg)
A	-	2	4000
B	8000	4	-
C	2000	-	1000
D	-	4	2000

Which object would float on water?

1. A
2. B
3. C
4. D

Whichscientist coined the term cell?

Elongated lignified cells with pointed ends belong to:

Which of the following has a direct effect on the kinetic energy of particles:

Which crop is grown between two cereal crops in crop rotation?

Guard cells are present in:

Mass number is denoted by: